It was Olivia de Havilland, who was nominated as Best Supporting Actress for her performance as Scarlett O'Hara's friendly rival for the affections of Ashley Wilkes. The Oscar went to her co-star, Hattie McDaniel, who played Mammy.
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Yes, she was an African-American slave girl/servant before the Yankees freed the slaves when they conquered the South in the American Civil War.
waterman
No. She was her sister-in-law.
Melanie Hamilton
It was George Ashley Wilkes.
According to the IMDb website, the role of Beau Wilkes, son of Ashley and Melanie Wilkes, was played by Mickey Kuhn (in the scene where Melanie is dying) and Gary Carlson (uncredited - in the scene where Melanie is feeding the returning soldiers.)